Re: 1996 CS running lean and hot - Saab 9000 Bulletin Board - Saabnet.com
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Re: 1996 CS running lean and hot
Posted by siwyjohn (more from siwyjohn) on Mon, 22 Feb 2021 23:06:37
In Reply to: 1996 CS running lean and hot, Dave The Ice Age Knave [Profile/Gallery]
, Sun, 21 Feb 2021 10:31:48
could you post pictures of spark plugs and what did you find inside cylinders?
light white deposit on plugs is pretty normal.
Generally if the car is running too lean/rich then O2 sensors should detect it, ECU should store trouble code and CEL should lit. You can attach diagnostic scanner or a scope to check first O2 sensor (the one before the cat) readout - it should alternate rich-lean-rich-lean-... Second sensor (after cat) only checks if the cat works properly.
Here is the NGK chart for visual plugs diagnostics.
posted by 80.50.141...
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